20543171800199 has 8 divisors (see below), whose sum is σ = 20575379743632. Its totient is φ = 20510986189120.

The previous prime is 20543171800187. The next prime is 20543171800241. The reversal of 20543171800199 is 99100817134502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20543171800199 - 2⁴⁰ = 19443660172423 is a prime.

It is a super-2 number, since 2×20543171800199² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543171800169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3741404 + ... + 7421889.

It is an arithmetic number, because the mean of its divisors is an integer number (2571922467954).

Almost surely, 2^{20543171800199} is an apocalyptic number.

20543171800199 is a deficient number, since it is larger than the sum of its proper divisors (32207943433).

20543171800199 is a wasteful number, since it uses less digits than its factorization.

20543171800199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11166177.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 20543171800199 in words is "twenty trillion, five hundred forty-three billion, one hundred seventy-one million, eight hundred thousand, one hundred ninety-nine".